/*
 *
 *
 *  * Copyright (c) 2017 Leo Lee(lichl.1980@163.com).
 *  *
 *  * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 *  * use this file except in compliance with the License. You may obtain a copy
 *  * of the License at
 *  *
 *  *   http://www.apache.org/licenses/LICENSE-2.0
 *  *
 *  * Unless required by applicable law or agreed to in writing, software
 *  * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 *  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 *  * License for the specific language governing permissions and limitations
 *  * under the License.
 *  *
 *
 */

package client;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

@Component
public class SpringContextUtilForServer implements ApplicationContextAware {//Spring的工具类，用来获得配置文件中的bean

    private static ApplicationContext applicationContext;

    /***
     * 当继承了ApplicationContextAware类之后，那么程序在调用
     * getBean(String)的时候会自动调用该方法，不用自己操作
     */
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        SpringContextUtilForServer.applicationContext = applicationContext;
    }

    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    /***
     * 根据一个bean的id获取配置文件中相应的bean
     *
     * @param name
     * @return
     * @throws BeansException
     */
    public static Object getBean(String name) throws BeansException {
        return applicationContext.getBean(name);
    }

    /***
     * 类似于getBean(String name)只是在参数中提供了需要返回到的类型。
     *
     * @param name
     * @param requiredType
     * @return
     * @throws BeansException
     */
    public static Object getBean(String name, Class requiredType) throws BeansException {
        return applicationContext.getBean(name, requiredType);
    }

    /**
     * 如果BeanFactory包含一个与所给名称匹配的bean定义，则返回true
     *
     * @param name
     * @return boolean
     */
    public static boolean containsBean(String name) {
        return applicationContext.containsBean(name);
    }

    /**
     * 判断以给定名字注册的bean定义是一个singleton还是一个prototype。
     * 如果与给定名字相应的bean定义没有被找到，将会抛出一个异常（NoSuchBeanDefinitionException）
     *
     * @param name
     * @return boolean
     * @throws NoSuchBeanDefinitionException
     */
    public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException {
        return applicationContext.isSingleton(name);
    }

    /**
     * @param name
     * @return Class 注册对象的类型
     * @throws NoSuchBeanDefinitionException
     */
    public static Class getType(String name) throws NoSuchBeanDefinitionException {
        return applicationContext.getType(name);
    }

    public static <T> T getBean(Class<T> tClass) throws NoSuchBeanDefinitionException {
        return applicationContext.getBean(tClass);
    }


    /**
     * 如果给定的bean名字在bean定义中有别名，则返回这些别名
     *
     * @param name
     * @return
     * @throws NoSuchBeanDefinitionException
     */
    public static String[] getAliases(String name) throws NoSuchBeanDefinitionException {
        return applicationContext.getAliases(name);
    }
}